[Xen-devel] [PATCH] Map Xen code/data/bss with superpages

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

And make use of NX and RO attributes wherever possible.

After this series, the pagetable layout looks like:

(XEN) *** Dumping Xen text/data/bss mappings from ffff82d080000000
(XEN) l2_xenmap: ffff82d080814000, pa 00000000ac014000
(XEN)  L4[261] = 00000000ac017063 X S RW P
(XEN)   L3[322] = 00000000ac014063 X S RW P
(XEN)    L2[000] = 00000000ab8001e1 X Gl + S RO P   <- .text
(XEN)    L2[001] = 00000000aba001a1 X Gl + S RO P   <- .text
(XEN)    L2[002] = 80000000abc001a1 NX Gl + S RO P  <- .rodata
                                                    <- discarded .init
(XEN)    L2[004] = 80000000ac0001e3 NX Gl + S RW P  <- .data and .bss
(XEN)    L2[511] = 000000084da6f063 X S RW P        <- stubs

Andrew Cooper (8):
  xen/lockprof: Move .lockprofile.data into .rodata
  xen/x86: Improvements to build-time pagetable generation
  xen/x86: Construct the {l2,l3}_bootmap at compile time
  xen/memguard: Drop memguard_init() entirely
  xen/x86: Disable CR0.WP while applying alternatives
  xen/x86: Reorder .data and .init when linking
  xen/x86: Use 2M superpages for text/data/bss mappings
  xen/x86: Unilaterally remove .init mappings

 xen/arch/arm/xen.lds.S       |  15 ++++---
 xen/arch/x86/alternative.c   |   7 +++
 xen/arch/x86/boot/head.S     |  18 +++-----
 xen/arch/x86/boot/x86_64.S   |  44 +++++++++++++++---
 xen/arch/x86/mm.c            |  16 -------
 xen/arch/x86/setup.c         |  64 +++++++++++++++++++--------
 xen/arch/x86/x86_64/mm.c     |   4 --
 xen/arch/x86/xen.lds.S       | 103 ++++++++++++++++++++++++++++---------------
 xen/include/asm-arm/config.h |   1 +
 xen/include/asm-arm/mm.h     |   1 -
 xen/include/asm-x86/config.h |   1 +
 xen/include/asm-x86/mm.h     |   2 -
 xen/include/asm-x86/setup.h  |   5 +++
 xen/include/xen/spinlock.h   |   2 +-
 14 files changed, 178 insertions(+), 105 deletions(-)

-- 
2.1.4


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